eturner

I have the above car in my workshop, brought in with the following
Starts and runs at idle fine
As soon as you try to rev it you get to about 1500 rpm and it coughs and splutters, backfires and the engine management light flashes.

Put my diagnostics gear on it and got the error 33, Map sensor, tested the map sensor using Ford instructions, checked out ok.

Is this a commo problem?
What normally causes this?

Thanks
Eric